Natalie Portman turns 40: a look back (25 images)

Cast member Portman arrives on the red carpet before the premiere of "Che" during the Cannes Film Festival in Cannes, France, on May 21, 2008. Photo by David Silpa/UPI

Portman arrives at the amfAR Cinema Against AIDS gala, taking place during the Cannes Film Festival in Cannes, France, on May 22, 2008. A couple months later, she joined the cast of "Thor." Photo by David Silpa/UPI

Portman (L) and director Don Roos attend the Toronto International Film Festival press conference for "Love and Other Impossible Pursuits" in Toronto, on September 16, 2009. Photo by Christine Chew/UPI

Cast member Portman attends the premiere of "No Strings Attached," that earned the No. 1 box office spot, in Los Angeles, on January 11, 2011. Photo by Jim Ruymen/UPI